I have an old EHT PSU to repair. There are 2 capacitors, one paper, one ply wood! The paper cap, which is uncased, tests as: 420nF 11 ohms ESR, 5% loss . I've not yet done a dc leak test, which it needs. What do you think of th ose figures? IME pre-war paper caps are highly suspect. I'd rather establis h what I can before subbing it, as the construction of the whole thing is r ather characterful.
NT